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18 is.

Q: What number is double 9?

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There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.

A negative number. (ex. -9)

If you start with 2.5 and double the number you have 9 times,you land on 1,280 .

2x + 9 = 27 2x = 18 x = 9

107 double difference each time 2 + 7 = 9 9 + 7 + 7 = 23 23 + 14 + 14 = 51 51 + 28 + 28 = 107

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multiplication you have to double the number. example like 9 multiplied by 2 is 18. in addition 9plus 9 is 18 so you double the number.

There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.

A negative number. (ex. -9)

25

If you start with 2.5 and double the number you have 9 times,you land on 1,280 .

2x + 9 = 27 2x = 18 x = 9

Don bradman - 9 i suppose

1st odd number . . . 1 (1 less than double 1)2nd odd number . . . 3 (1 less than double 2)3rd odd number . . . 5 (1 less than double 3)4th odd number . . . 7 (1 less than double 4)5th odd number . . . 9 (1 less than double 5)Are you seeing a pattern yet ?6th odd number . . . 11 (1 less than double 6)7th odd number . . . 13 (1 less than double 7)...Qth odd number . . . . (1 less than double Q)

1st odd number . . . 1 (1 less than double 1)2nd odd number . . . 3 (1 less than double 2)3rd odd number . . . 5 (1 less than double 3)4th odd number . . . 7 (1 less than double 4)5th odd number . . . 9 (1 less than double 5)Are you seeing a pattern yet ?6th odd number . . . 11 (1 less than double 6)7th odd number . . . 13 (1 less than double 7)...Qth odd number . . . . (1 less than double Q)

15-145 usd

It a dart lands in the double 9 bed, the score is 9 x 2 = 18

Not necessarily.